Chuck



F. COBEY.

CHUCK. APPLICATKON FILED MAR- 29. 1912.

1,394,659. Patented May 27, 1919.

v 4 x Java/77017:

"- v Fwy FRANK COBEY, EAST BERLIN, CONNECTICUT.

CHUCK.

Specification of Letters IEatent.

Patented May 27, 1919.

Application filed March 29, 1917. Serial No. 158,286.

To all whom it may concern:

Be it known that I, FRANK GOBEY, a citi zen of the United States,residing at East Berlin, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inChucks, of which the following is a' specification.

My invention relates to improvements in chucks, and the object of myimprovement is simplicity and economy in construction and convenienceand efiiciency in use and as pertaining to the feature of the backing orthrust screw shown and to be described the present application is anamplification of application Serial No. 28,170, filed May 14, 1915, anda companion to application Serial No. 158,285.

In the accompanying drawing r Figure 1 is a side elevation of myimproved chuck.

Fig. 2 is an end elevation of the same.

Fig. 3 is a sectional view on an'enlarged scale on the line 33 of Fig.2.

Fig. 4 is a side elevation of the main part of the spindle member. 1

Fig. 5 is a similar view of the outer member of the carriage portion ofthe spindle member.

Fig. 6 is a similar view of the inner member of the same. i

Fig. 7, is a sectional View on the line 77 of Fig. 3.

Fig. 8, is a sectional View on the line 8-8 of Fig. 3. 1

Fig. 9, is an endelevation ofthe thrust screw.

Fig. 10, is a sectional View on the line 10101 of Fig. 3.

My improved chuck comprises a spindle member 10, a shell member 11', aset of jaws 12 operativelyhouse'd in the said members, and an axiallypositioned thrust screw 13, the said spindle member and shell memberbeing each built up of a plurality of parts.

T e spindle member IO-cOmprises a main part 14 and a carriage supportedthereby composed of an inner part 15 and an oute part 16. V

The main part 14 has a bore composed of a socket portion 17 at the innerendthat is in the form of a tapered socket to fit thecorrespondinglytapered end of a spindle,and a threadedv portion 18'ofrelatively small diameter at the outer end that is operatively engagedwith the thrust screw 13.

. On the exterior the mainpart 14 comtion 19 serves as a bearing for therear part I 25 of the shell member 11.

The stem 24 is ofappreciable length, has

a cylindrical, threaded periphery 26 for the major part of the length,and has adjacent the outer end a short conical periphery 27 that mergesinto a short cylindrical portion 28 at the extreme outer end. .Theperiphery 29 of th flange 22 is cylindrical and serves as a rear bearingfor the front part 30 of the shell member 11 and the reduced cylindricalend portion 28 of the stem 24 servesas the outer bearing for the same.

The parts 15 and 16 that compose the carriage are each of annular formand of about the same length and are appreciably shorter than thethreaded portion 26 of the stem 24, suitably to travel along the same,the said parts being superimposed the one on the other and each having aset of keyhole slots for receiving the cross-ribs 31 on the rear ends ofthe jaws 12. The inner part 15 has a threaded inner wall 32 that is anoperative fit for the thread 26 on'the stem 24, is provided with arelatively coarse thread 52 on the periphery, and has the keyhole slots'33 for the ribs '31, there being three slots 33 to correspond with thenumber of jaws 12.

The outer part 16 has a cylindrical periphery, has an: interior coarsethread 34 to fit tion the'same at a slight inclination from the radius,the keyhole slots 33 and 35, being correspondingly inclined, as in thismanner the ribs 31 may be made longer with a given diameter of the jaws12 and a morefirm clamping'is effected by the jaws.

The key-hole slots/3.5 the outer part 16 are made a good fit for thecross-ribs 31 so that these parts are always in close engagement, andthe key-h0leslots 33 in the inner part 15 are made an appreciably loosefit.v

for the said ribs 31, whereby a limited rela tion rotartive movement ispermitted of the outer part 16" on the inner part 15 in cooperation withthe coarse thread engage: ment of these parts by means of the threads34' and 32,.

The shell member 11 is composed of the rearpart 25 and the front part30.

The front part 30 extends over the spindle member 10 from the front endrearwardly as far as the rear face of the flange 22, has the slots 36for the jaws 12, has an annular shoulder 37 adjacent the rear end, and areduced neck 38 extending rearwardly from the said shoulder 37 that isthreaded onthe periphery 38;

On the interior the front part 30has a bore composed of a cylindricalportion 39 that bears against the periphery 29 of the flange 22-, aslightly reduced main portion 40 that extends over the stem 24 and fitsover the carriage, has a cylind ricail'bearing portion 41 thatengages-with-the end bearing 28 on the stem 24, and outwardly from thebearing po'rtionlO and opposed: to the end face of the stem 2st isprovided-with a washer 2 that is forced in" place and has non-circularhole 4c3-tliat is; a fit for the thrust screw 13.

As shown, the thrust screw 13' has fiat sides 44 in oppositesides and isdriven by the washer 49/.

The utilizationof the washer 21 for drivingthe thrustscrew 13-is aconstruction featureandin lieu thereof there maybe: pro vided anintegral wehhaving the hole 43;

The rear part 25 serves as a-closu-re for the shell member and has abore composed of the cylindrical portion 45, an enlargement 46 that fitsover'the balls 21, has a shoulder 47' that-bearsagainst the rear face ofthe flange 22 and also against the end" of the neck 38 of the front part30-: andl'iasat the front end an: overhanging annular portion 48 thatextends over the saidneck 38 and has threaded engagement therewith.

In use, asrthe shell member is rotated rel atively to the spindle memberthe jaws are moved to and fro in the longitudinal-slots or waysby reasonof the'engagement ofthc carriage with the jaws and also with the stem ofthe main partof the: spindle memher, the carriage. serving as theconnecting means between the jaws and the spindle, and the thrust screw}is simultaneously moved axially to and fro.

By having the carriage composed-1 0t two parts as described, with the:parts engaged by means of the coarse thread; a means is providedfor-.efiectin-g aquick release of the jaws. Fur hermore, by having bothparts of the carriage provided with ways for engaging with the jaws bothparts of the carriage are rotated with the jaws and by providing for aloose fit for the jaws and the ways in one of the said parts asdescribed a means. is provided for limiting the relative travel of thesaid parts along the said coarse thread; Thus means are provided forliniiting the quick release eli'ect Without the provision of a specialstop or lug on one part and a corresponding recess on the other part.

In the sectional view shown in Fig. 7 the cross-mil) 31 of the jaw 12 isshown to bea good fit for the way in the outer part 1'6 of the carriagewith which it is engaged.

Fig. 8 corresponds generally to Fig: 7 with the section taken acrosstheinner part 15 instead of the outer part 16;. In this view the cross rib31 is shown as a loose fit in the way 33, there being clearance4917ctween the opposed walls.

The coarse thread portions: of the two co operating parts of thecarriage operate as helical GHClCEtHT members and in lieu thereof someother form of end cam construction may be used;v

I claim as-my invention 1. A chuck comprising a spindle member having anannular bearing flange, a'shell member inclosing the said'sp-indlemember, a set of jaws operatively housed in the said members, the saidsliel'lnieiiiber being eoinposed of two parts only that are joinedtogether adjacent the said'flange by cooperating threaded portions, andthe said two parts having coiiperating annular shoulders for limitingthe movement of the threaded portions in connecting the two partstogether;

2. In a chuck comprising a spindle memher; a shell member, and a set'ofjaws operatively housed in the said members,- and the said jaws. beingof elongated form and each having at the inner end a cross-rib thatserves as the means of connection with the said spindle niemberandthe'said cross-rib being directed atan angle tothe radial line of thesaid jaws.

3 In a chuck comprising a spindle-membier, a shell member,- and a set ofjaws operatiuel-y housed in the saidmembers, the said jaws,beinggenerally of cylindrical form and each having-at the inner enda-crosseri'b' that serves as the means ofconnection' with: the saidspindle member; and the said cross-ribs being positioned in angularrelation to the radius;

41 A chuck comprising spindle member, a shell: member, and'a set of'jawsoperatively housed'in'the said members, the 'said spin dl'emembercomprising a main part-having a threaded stem at the front end,anda carriage operatively mounted-on the said stem, the said carriagebeing composed of an inner part engaged with the said stem and an outerpart engaged with the said inner part by means of a relatively coarsethread, and both of the said parts having generally radial ways forengaging with the ends of the said jaws.

5. A chuck comprising a spindle member, a shell member, and a set ofjaws operatively housed inthe said members, the said spindle membercomprising a main part having a threaded stem at the front end, and acarriage operatively mounted on the said stem, the said carriage beingcomposed of an inner part engaged with the said stem and an outer partengaged with the said inner part by means of a relatively coarse thread,both of the said parts having generally radial ways for engaging withthe ends of the said jaws, and the said parts being of annular form, andbeing of substantially the same length.

6. A chuck comprising a spindle member, a shell member, and a set ofjaws operatively housed in the said members, the said spindle membercomprising a main part having a threaded stem at the front end, and acarriage operatively mounted on the said stem, the said carriage beingcomposed of an inner part engaged with the said stem and an outer partengaged with the said inner part by means of a relatively coarse thread,both, of the said parts having generally radial ways for engaging withthe ends of the said jaws, and means for limiting the relative travel ofthe said parts along the said coarse thread.

7. A chuck comprising a spindle member, a shell member, and a set ofjaws operatively housed in the said members, the said spindle membercomprising a main part having a threaded stem at the front end, and acarriage operatively mounted on the said stem, the said carriage beingcomposed of an inner part engaged with the said stem and an outer partengaged with the said inner part by means of a relatively coarse thread,both of the said parts having generally radial ways for engaging withthe ends of the said jaws, the said jaws having cross-ribs at the innerends, the said parts both having ways for engaging with all of the saidcross-ribs, and the ways in one of the said parts being a close fit forthe crossribs with which they are engaged and the ways in the other ofthe said parts being a loose fit for the same.

8. In a chuck having means for effecting a quick release of the jawscomprising a carriage composed of two parts rotatively and slidablymounted one on the other, having opposed helical end cam portions, andprovided with means for limiting the relative rotative movements of thesaid parts, and both of the said parts having means for engagingdirectly with the jaws.

FRANK COBEY. Witnesses:

HAROLD R. JoNEs, ALFRED L. THOMPSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). G.

